Enclosed mechanism



Feb. 27, 1940. A, ANGSANER 2,192,133

ENCLOSED MECHANISM Original Filed Jan.l3l, 1938 223 if 259 ZW' ATTORNEY.

yPatented Feb. l27, 1940 t ENCLSED MEcHANIsM l Adolph Langsner, Chicago,l lll., assigner 'to Eugene Dietzgen Co., Chicago, Ill., a corporation of Delaware -Original application January 31, y1938, Serial Divided andl this applic'ationv I October 18, 1939, Serial N0. v299,930

Claims.

My invention relates in general to measuring 1 instruments and has more particular reference to alidades and similar precision instruments for use in surveying; the same ycomlznrising.subjectvg matter divided from my copendingapplication,

.Serial N0. 187,997, filed January 3l, 1938.

important object is to provide instrument casing having a dust-proof cover including fasteners of novel construction normally. connected to the cover and adapted for detachable engagement with the casing, Aon which the .cover is removably secured f n Another important object is. to provide screw Ifasteners for ay cover member or the like ...comprising a stemhaving ahead at one end, screw threads at the other, andan intermediate restrictedportion interconnecting the threaded and headed portions ofthe stem -whereby the fastening devices may be secured on said cover by screwing the threaded portion entirely. through a threaded opening inthe cover wherebyv the fastening member is loosely secured on the cover with the restricted portion of thestemextending vin the threaded opening of the cover and retained same.

Another important object is to provide animproved oase for .Compasses and the like, wherein the casing has relatively narrow, elongated con-I figuration for mounting in position where the available space is restricted as to width; the casing having integral curved ends containing scale `blocks of improved form and construction.

, A further object is to provide `a pointer lifting mechanism of improved construction, including dust-proof means for actuating'the mechanism f and lifting the pointer Within acasing in response ,to manipulation of the mechanism outwardly of thecasing. l

Numerous other objects` and advantages `of the invention will be apparent from the following description, which, takenv in connection with the accompanying drawing,disclose's preferred' emf bodiments of my invention. 1

Referring to thedrawing': i Figure 1 is a top plan View of* a casing embodying my present invention; y

' Figure 2 is a sectional `vievv'y taken substantially along the lineZ-l2 lin Figure l; and v l p Figures 3 and 4- are enlarged sectional views taken substantially along lines 3--3and 4 4, respectivelyf. g

y,To illustrate my invention drawing an instrument case ,of elongated co-nin place bythe headed and threaded endsof the ,'I have shown in the figuration and adapted more particularly for i mounting as on a base or support 21, such as the standard of analidade' Where vthe 'width' ofthev mounting is limited. -At the same time, Where theA i case is used to house a compass, it is desirable that the pointer 261'I be of appreciable length in order. Sto aord a substantial deflection for easy'measurement. I Wish also to provide a dust-.proof en- 1 j closure to exclude dirt, moisture and other deleterious foreign matter from the instrument housed within the casing. y

,To'this end, 'as shown in the illustrated lembodiment, the case comprises an elongatedfhouse ing 25| having a bottom'253 and preferably integral upstanding side walls, said walls having rounded or curved portions 255 at the opposed ends of` the casingand parallel spacer-apart side portions 251. The compass needle support pin y 259 is mounted on the bottom Wall 253 in position extending upwardly thereof aty the substantial mid-portionv of thecasing. This pin carries a comp-ass needle 25! provided with a bearingsleeve .263 at its mid-point, saidl sleeve having a bearing element 265 adapted to rest on the. upper end of the pin. The compass needle 261 issubstanv tially longer than the width between the spaced side wall portions 251. In 'the opposed ends of the casing. are arranged blocks 2,61 having'surf iov faces ESQ substantially concentric with respect l yto the pin 259, said surfaces being positioned opposite the ends of the compass pin so that the same `will sweep adjacent said surfaces. The l.blocks 261 have scales 211 marked thereon adjacent the surfaces 269 so that the deflection ofthe compass needle may be measured.

The blocks 261 may be formed integral with lthe Walls of the case, but preferably are secured' in the casing 251 in any suitable fashion as by .means of the holding screws 213 penetrating the y bottom of said casing and taking into said blocks.

'Ihe ycasing `251 has an open top and I have .prol vided a removable cover for the casing formedl in such a Way as to prevent entranceof dust into the casing at the edges of the cover. To this` end, the covercomprises a frame 215 of shape corresponding to the configuration of the sidewalls of the casing. The frame 215 carries aV translucent Window 211, ,y preferably glass, through vwhich the compass needle may be readily perceived when the cover is positioned and secured on the case The cover 215 and the upper edges' of the Walls of thecasing are formedwith an 4interiitting tongue and groove formation indicated at 21S, and the cover is adapted to be removably secured inplace by fastening elements 28|,- which extend in kperforatiorxs formed in the at one end'and threaded at the other, with an nently, though loosely, assembled on the cover. -In order to fasten the cover on the casing intermediate neck interconnecting the headed and threaded portions. The fastening elements 28| are'applied to the cover` through openingsl 285, which are of a diameter and threaded to permit the threaded portions ofthe fastening elements to be screwed therethrough in assembling Athe fastening members on the cover.

After the threaded portions of the `fastening members have been screwed completely through the threaded openings 285, the interconnecting portions will be looselyheld in said openings since neither the headed nor threaded portions of thefastening members are small enough to be drawn axially through the openings. Consequently', the fastening members will be permait is merely. necessary to apply the same and turn theexposed heads of the fastening members 28| in order to engagel the threaded portions thereof in the sockets-235. i i i I also provide dust-proof means whereby the compass needle 26| may be raised from thepin `259 when the instrument is not in use, in order to preserve the pinA and the bearing element 265 from damage. To this end, I arrange a substantially flat or leaf spring 28T on the bottom of the casing. The spring is held on the bottom at oneend by a fastening screw 289' and extends from said screw to the pin, the spring having a perforation `adapted to receive said pin. The spring is slightly bowed so that it will normally assume a position on the pin lifting the needle from the point of the pin. When lifted, one end of the bearing 253 is supported on a seat 29| formed on the spring in position enclosing the pin.

The spring 281 is formed intermediate its ends with an upwardly bowed portion 293 and a rotatable element, having a cam portion 295 and a shaft 29l, and is arranged with the shaft lportion 291 journaled in a bushing 299 formed in one of the walls 281 opposite the bowed portion 293 of the spring, the cam portion 295 overlying said bowed portion. The cam portion comprises a cylindrical disk having a flattened surface 39| on one side. The endof the shaft portion 291, remote from the cam portion 295, projects from the outer surface of the wall and is fitted with a spring disk 303 and a handle 305. The handle and disk is held on the end of the shaft by a` fastening screw 391 so that the disk not only serves to enclose the outer end of the bushing 299 and thus minimize the possibility of penetration of foreign matter between the shaft and the bushing, but also to urge the shaft' outwardly in the bushing so thatv the cam portion 295 will be against the inner surface of the wall in position opposite thev bowed portion 293 of the spring. The handle 355 may be arranged in the position shown in Figures 7 and 8, in which the curved surface of the cam member engages and presses upon the bowed portion 293 of the spring and thus'maintains the same in depressed position permitting the compass needle to rest upon the pin in operative position. From Athis position, the handle may be depressed in a counterclockwise direction, viewing Figure '7, in orderto force the flat surface 20| toward the bowed portion 293 of the spring, and thus drop the compass needle 26| .onto the pin 259. o

It will be seen that the construction is simple and inexpensive, and at .the same time provides a casehaving an attractivejappearance. .Thel cover fastening screws cannot become lost whenk the cover is removed, yet can be readily assembled on the cover. The case is substantially dustproof, while the pointer lifting mechanism permits operation thereof from outside the case while excluding foreignmatter.

It is thought that'the invention and numerous of its attendant advantages will be understood ,n from the foregoing description, and itis obvious that numerous changes may be madein the form,

construction, and arrangement of the several parts of the illustrated apparatus withoutdeparting from the spirit or scope Iof my invention or sacrificing any of its attendantadvantages,'the forms herein described being merely for the pur-ky pose of illustrating the invention. 1:.'- The invention is hereby claimed vas follows:l L 1. A device of the character describedcomprising, in combination, an elongated, elliptical base, an upstanding flange surrounding thebase y l and formed integrally therewith, a plurality of..

scale blocks associated with the opposite ends of the base and arranged to conform to the shape if;

of the surrounding flange, fastenersfor securing the scale blocks to the base, a plurality of shoulders formed integrally upon the scale blocks, a transparent closure member resting upon said shoulders and shaped. to conform-.to the inside contour of the surroundingy iange, a rim arranged to cooperate with the upper edge of the surrounding flange'in maintainingI the closure member in assembledposition, fastenersextending between the rim andthe shoulders ofthef scale blocks for securing the rim in position, and

anindicator element mounted upon vsaid base l I beneath said transparent closure member.

2. A device of the character described comprisn ing, in combination, an elongated, elliptical base,

an upstanding flange surrounding the base'and v formed, integrally therewith, a plurality of scale blocks associated with the opposite ends of the base and arranged to conform to the shape of the surrounding flange, fasteners for securing the scale blocks to thebase, a plurality of shoulders formed integrallyupon. the scale blocks,'a transparent closure member restinguponsaid shoulders and shaped vto conform to the inside conf tour of the'surroundingxflange, a rim arranged to cooperate with the upper edge of the surrounding flange in maintaining the closure member` 3. A device `of the character'described comprise5 ing, in combination,'an elongated, elliptical base,

an `upstanding flange'surrour'iding'thel base and formed integrally therewith, la plurality of scale Vin assembled position, fasteners extending beblocks associated with' the opposite 'ends of the o base and arranged tol conform'to the Yshape ofi the surrounding flange, fasteners for seeming the scale blocks to the base, a plurality of-'shoulders forme-d integrally uponv the scale blocks, a transparent closure member resting .upon'said shoulders and shaped to conform to `the inside .75;

contour of the surrounding iiange, a rim arranged to cooperate with the upper edge of the surrounding ange in maintaining the closure member in assembled position, fasteners extending between the rim and the shoulders of the scale blocks for securing the rim in position, an indicator element mounted upon said base beneath said transparent closure member, and

means for raising' and lowering sai-d indicator element between inoperative and. operative positions, said means comprising a stub shaft journaled in the upstanding flange and an operating lever attached to the outer extremity of the shaft.

ADOLPI-I LANGSNER. 

